Originally Posted by Ben B
I tried some NOS RCA tubes in my 3 pro which is similar to the 4 pro. I couldn't hear a difference between them and the groove tubes that came with it.
I totally believe you. Some circuits just aren't sensitive to tube changes and others it is like night or day. Or maybe you wouldn't notice the difference unless you pushed the preamp into clipping. But looking inside of the 4 pro, there is a whole lot going on besides those 3 tubes.
Regardless, I am still going to give it a try. I might get better tone just by virtue of replacing worn tubes with stronger tubes.
Originally Posted by mjac28
+1 I agree with Jimmy there are so many cheaper tubes that sound really great but they get bashed so people overlook them. I have a nice NOS vintage RCA Black plate in my Mesa and it cost me plenty but it doesn't sound that much better than a cheaper NOS GE tube?. I started tube rolling last year and I have a collection of vintage Mullard's,TeleFunken's, Rayteheon's ,GE's,Sylvania's etc and I was paying stupid amounts of money until my new tube guy talked about cheaper lesser known tubes that sound just as good like the Sovteks,Sylvania's and GE tubes and even some of the Chinese tubes sound great.
Who's your new tube guy?